Gary Giddins interviews Kai Bird, whose new book is The Good Spy: The Life and Death of Robert Ames, the first biography of the CIA officer killed in the 1983 Beirut Embassy bombing. Bird is also the author of Crossing Mandelbaum Gate, The Chairman, The Color of Truth, and American Prometheus: The Triumph and Tragedy of J. Robert Oppenheimer, co-written with Martin J. Sherwin, which won the Pulitzer Prize in Biography.